Repair a burnt GI connector on the driver board

Steps

• Remove the driver board.
• Desolder and remove the old male header pins at the burnt connector (J115, J120, J121; J103, J105, J106 on WPC-95).
• Check continuity between the front and back pads of every hole; broken plated-through holes are common on these traces.
• Where a hole has no continuity, push a few strands of wire through it, fold them over both pads and solder on the component side (a solder stitch).
• Fit new .156 inch header pins and solder them on the solder side.
• Re-check continuity from each pin to its fuse and triac, then fit a new housing with crimped Trifurcon pins.

Burnt connectors and pins can be hot enough to burn skin; power off and let the board cool before handling.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• GI connectors on the driver board
• Lamp matrix connectors on the driver board
• GI string dead with a scorched connector
• Backbox GI out while flashers work: burnt connectors at J120 and J121
• GI out because the GI connector burned
• Check the AC power input connectors too
• Resets from worn power connectors between transformer, driver and CPU boards
• Burned power driver board traces at the header feeding AC to the Fliptronic board

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part One, Clay Harrell (pinrepair.com)